大直径深嵌岩桩的承载特性与桩长设计研究

摘要

Based on self-balancing pile foundation testing technology, the beating characteristic of large-diameter bored socketed pile in mud rock area with deep socket length is studied according to the static load test on a pile of Jingyue Yangtze River Highway Bridge.The result shows that Q-S Curve of large-diameter deep-socketed pile tip is mainly of easement curve, belonging to friction pile.According to the measured lateral load displacement curve, the load of pile tip when shortened 5 m and 10 m and the corresponding displacement are separately studied using load transfer method, which provides reference for pile length design.%基于自平衡桩基测试技术,根据荆岳长江公路大桥一桩的静载荷试验,对其泥质岩地区大直径钻孔嵌岩桩,在嵌岩深度较大情况下的承载特性进行了研究.结果表明:大直径深长嵌岩桩桩顶的Q-S曲线主要是缓变型为主,属摩擦型桩.根据实测的桩侧荷载位移曲线,利用荷栽传递法,研究了桩端缩短5,10 m两种情况下桩顶的荷载大小及其相应的位移情况,为桩长的设计提供了依据.